HOW TO FIX: CONNECTION ISSUES

Opens up "Windows Firewall" setting / "Windows Firewall with Advanced Security", and navigate to "Inbound Rules". Change the action of the rule named "RESIDENT EVIL 6" which targets "UDP" protocol to "Allow the connection" instead of "Block the connection". (Reloaded installer has added this blocking rule by default which does not allow you to create servers)

Go to Settings -> Downloads & Cloud -> Download region, and set it to "UK - London" or the same as your Friend